:root{
  --t:13px; /* chat text size: very small by default (Settings → Text size) */
  --bg:#000; --card:#1c1c1e; --card2:#2c2c2e; --text:#fff; --muted:#8e8e93; --line:#38383a;
  --orange:#ff9f0a; --key:#333333; --fn:#a5a5a5;
  --me:#0a84ff; --them:#2c2c2e; --danger:#ff453a; --ok:#30d158;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
[hidden]{display:none!important}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.4 -apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,sans-serif;overflow:hidden}
button{font:inherit;color:inherit;cursor:pointer}
h1{font-size:26px;margin:0 0 8px}
h2{font-size:20px;margin:0}
.screen{position:fixed;left:0;right:0;top:var(--app-top,0);height:var(--app-h,100%);display:flex;flex-direction:column}

/* ---------- unit converter (the cover) ---------- */
.units{overflow-y:auto;padding:calc(14px + env(safe-area-inset-top)) 16px calc(24px + env(safe-area-inset-bottom));max-width:520px;margin:0 auto;left:0;right:0}
.u-title{font-size:34px;font-weight:700;margin:6px 4px 12px}
.u-cats{display:flex;gap:6px;overflow-x:auto;padding-bottom:4px;margin:0 -16px 14px;padding-left:16px;padding-right:16px;scrollbar-width:none}
.u-cats::-webkit-scrollbar{display:none}
.u-cats button{flex:none;border:0;background:var(--card2);color:var(--text);border-radius:99px;padding:8px 14px;font-size:15px;font-weight:600}
.u-cats button.on{background:var(--orange);color:#000}
.u-card{position:relative;background:var(--card);border-radius:20px;padding:14px 16px}
.u-label{display:block;color:var(--muted);font-size:13px;font-weight:600;margin:4px 0 6px}
.u-row{display:flex;gap:10px;align-items:center}
.u-num{flex:1;min-width:0;font:inherit;font-size:34px;font-weight:500;background:none;border:0;color:var(--text);padding:4px 0;outline:none;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.u-num.out{color:var(--orange)}
.u-unit{flex:none;max-width:48%;font:inherit;font-size:16px;background:var(--card2);color:var(--text);border:0;border-radius:12px;padding:10px 12px}
.u-swap{display:block;margin:10px auto;width:44px;height:44px;border-radius:50%;border:0;background:var(--card2);color:var(--orange);font-size:22px}
.u-swap:active{background:#48484a}
.u-formula{color:var(--muted);font-size:14px;text-align:center;margin:12px 0 0}
.u-sub{font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin:22px 4px 8px}
.u-quick{background:var(--card);border-radius:16px;overflow:hidden}
.u-quick div{display:flex;justify-content:space-between;padding:12px 16px;border-top:1px solid var(--line);font-size:15px}
.u-quick div:first-child{border-top:0}
.u-quick b{font-weight:500;color:var(--muted)}

/* ---------- simple pages ---------- */
.page{overflow:auto;padding:calc(24px + env(safe-area-inset-top)) 16px 24px;align-items:center}
.card{width:100%;max-width:440px;background:var(--card);border-radius:20px;padding:20px}
.sub{color:var(--muted);margin:6px 0 0;font-size:15px}
.fine{color:var(--muted);font-size:13px;margin:12px 0 0}
.label{display:block;font-size:14px;color:var(--muted);font-weight:600;margin:14px 0 6px}
.field{display:block;width:100%;font:inherit;font-size:17px;padding:12px;border-radius:12px;border:1px solid var(--line);background:#000;color:var(--text)}
.btn{display:block;width:100%;margin-top:12px;min-height:48px;padding:12px;border-radius:14px;border:0;background:var(--card2);font-weight:600;text-align:center}
.btn.primary{background:var(--me)}
.btn.danger{color:var(--danger)}
.btn.small{min-height:42px;padding:9px;font-size:15px;margin-top:8px}
.btn.link{background:none;color:var(--me)}
.icon-btn{width:44px;height:44px;border:0;background:none;font-size:22px;border-radius:12px;display:flex;align-items:center;justify-content:center;flex:none}

/* ---------- chat ---------- */
.chat{height:100%}
.bar{display:flex;align-items:center;gap:6px;padding:calc(6px + env(safe-area-inset-top)) 8px 6px;background:rgba(28,28,30,.92);
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-bottom:1px solid var(--line)}
.who{flex:1;text-align:center;min-width:0}
.who b{display:block;font-size:calc(var(--t) + 2px)}
.who small{display:block;color:var(--muted);font-size:calc(var(--t) - 3px)}
.timer-note{text-align:center;font-size:calc(var(--t) - 2px);color:var(--orange);padding:6px 10px;background:#1a1203}
.msgs{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:12px 10px 8px;display:flex;flex-direction:column;gap:2px}
.day{align-self:center;color:var(--muted);font-size:calc(var(--t) - 2px);font-weight:600;margin:10px 0 6px}
.sys{align-self:center;color:var(--muted);font-size:calc(var(--t) - 2px);text-align:center;margin:6px 20px;max-width:90%}
.m{display:flex;flex-direction:column;max-width:78%;margin-top:6px}
.m.me{align-self:flex-end;align-items:flex-end}
.m.them{align-self:flex-start;align-items:flex-start}
.bub{position:relative;padding:calc(var(--t) * .45) calc(var(--t) * .75);border-radius:calc(var(--t) + 4px);background:var(--them);font-size:var(--t);line-height:1.35;white-space:pre-wrap;word-wrap:break-word;overflow-wrap:anywhere;
  -webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.m.me .bub{background:var(--me)}
.bub.media{padding:3px;background:none!important}
.bub.media .cap{padding:6px 9px 4px;background:var(--them);border-radius:0 0 16px 16px;margin-top:-4px}
.m.me .bub.media .cap{background:var(--me)}
.media-box{position:relative;border-radius:16px;overflow:hidden;background:#111;min-width:120px;min-height:120px;max-width:260px}
.media-box img,.media-box video{display:block;max-width:260px;max-height:340px;width:100%;object-fit:cover;-webkit-touch-callout:none;pointer-events:none}
.media-box .shield{position:absolute;inset:0}
.media-box .play{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:44px;text-shadow:0 2px 8px #000}
.media-box .loading{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:var(--muted);font-size:13px}
.meta{font-size:calc(var(--t) - 3px);color:var(--muted);margin:3px 6px 0}
.meta .exp{color:var(--orange)}
.reacts{display:flex;gap:2px;margin:-6px 8px 0;z-index:1}
.reacts span{background:var(--card2);border:2px solid var(--bg);border-radius:12px;padding:0 4px;font-size:calc(var(--t) - 1px);line-height:1.45}
.pending .bub{opacity:.6}
.composer{display:flex;align-items:flex-end;gap:6px;padding:8px 8px calc(8px + env(safe-area-inset-bottom));background:rgba(28,28,30,.92);border-top:1px solid var(--line)}
.attach{font-size:22px;cursor:pointer}
#text{flex:1;resize:none;max-height:120px;font:inherit;font-size:var(--t);padding:8px 13px;border-radius:20px;border:1px solid var(--line);background:#000;color:var(--text)}
.send{width:40px;height:40px;border-radius:50%;border:0;background:var(--me);font-size:18px;flex:none}
.send:disabled{opacity:.4}
.empty{color:var(--muted);text-align:center;margin:auto;font-size:var(--t);padding:30px}

/* ---------- sheets ---------- */
.sheet{position:fixed;inset:0;z-index:20;display:flex;align-items:flex-end;justify-content:center}
.sheet-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.55)}
.sheet-body{position:relative;width:100%;max-width:520px;max-height:90vh;overflow:auto;background:var(--card);border-radius:22px 22px 0 0;
  padding:16px 16px calc(16px + env(safe-area-inset-bottom));animation:up .18s ease-out}
@keyframes up{from{transform:translateY(30px);opacity:0}to{transform:none;opacity:1}}
.sheet-head{display:flex;align-items:center;justify-content:space-between}
.sheet-body h3{font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin:20px 4px 6px}
.sheet-body h3 small{text-transform:none;letter-spacing:0;font-weight:400}
.row{display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--card2);padding:12px 14px;border-radius:12px;margin-top:6px}
.row small{display:block;color:var(--muted);font-size:12px;margin-top:2px}
.switch{appearance:none;-webkit-appearance:none;width:51px;height:31px;border-radius:99px;background:#39393d;position:relative;flex:none;transition:background .2s;cursor:pointer;margin:0}
.switch::after{content:"";position:absolute;top:2px;left:2px;width:27px;height:27px;border-radius:50%;background:#fff;transition:left .2s}
.switch:checked{background:var(--ok)}
.switch:checked::after{left:22px}
.mini{font:inherit;font-size:15px;background:#000;color:var(--text);border:1px solid var(--line);border-radius:10px;padding:6px 8px;max-width:58%}
.small-sheet{padding-top:18px}
.emojis{display:flex;justify-content:space-between;gap:4px;background:var(--card2);border-radius:30px;padding:6px 8px}
.emojis button{border:0;background:none;font-size:28px;width:44px;height:44px;border-radius:50%}
.emojis button.on{background:#48484a}

.pv-media{margin:12px 0;border-radius:16px;overflow:hidden;background:#111;display:flex;justify-content:center}
.pv-media img,.pv-media video{display:block;max-width:100%;max-height:45vh}
#pvCaption{resize:none;margin-top:4px}

.viewer{position:fixed;inset:0;z-index:40;background:#000;display:flex;align-items:center;justify-content:center}
.viewer img,.viewer video{max-width:100%;max-height:100%;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none}
.viewer .x{position:absolute;top:calc(10px + env(safe-area-inset-top));right:12px;z-index:2;width:44px;height:44px;border-radius:50%;border:0;background:rgba(255,255,255,.18);font-size:20px}

.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(90px + env(safe-area-inset-bottom));background:#fff;color:#000;
  padding:10px 16px;border-radius:999px;font-size:14px;z-index:50;max-width:90%;text-align:center}
html[data-size="small"]{--t:14.5px}
html[data-size="normal"]{--t:16px}
/* chat font (Settings → Font). Only the chat and its panels change; the converter keeps the normal look */
.chat,.sheet,.viewer{font-family:var(--chat-font,inherit)}
.chat textarea,.sheet .field,.sheet select,.sheet button{font-family:inherit}
html[data-font="rounded"]{--chat-font:ui-rounded,"SF Pro Rounded","Hiragino Maru Gothic ProN","Arial Rounded MT Bold",system-ui,sans-serif}
html[data-font="serif"]{--chat-font:ui-serif,"New York",Georgia,"Times New Roman",serif}
html[data-font="type"]{--chat-font:"American Typewriter",ui-monospace,"SF Mono",Menlo,"Courier New",monospace}
html[data-font="hand"]{--chat-font:"Noteworthy","Chalkboard SE","Bradley Hand","Segoe Print","Comic Sans MS",cursive}
html[data-font="avenir"]{--chat-font:"Avenir Next",Avenir,"Century Gothic","Segoe UI",sans-serif}
/* pinned message bar */
.pin-bar{display:flex;align-items:center;gap:8px;width:100%;border:0;border-bottom:1px solid var(--line);background:#141416;color:var(--text);
  padding:7px 12px;text-align:left;font-size:calc(var(--t) - 1px);cursor:pointer}
.pin-bar b{flex:none;color:var(--orange);font-weight:600}
.pin-bar span{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--muted)}
.m.flash .bub{animation:flash 1.2s ease-out}
@keyframes flash{0%,40%{box-shadow:0 0 0 3px var(--orange)}100%{box-shadow:0 0 0 0 transparent}}
.meta .pin{color:var(--orange)}
/* long-press menu: the pressed message lifts above a blurred chat, with a small emoji bar and a short list */
.ctx{position:fixed;inset:0;z-index:30}
.ctx-back{position:absolute;inset:0;background:rgba(0,0,0,.5);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}
.ctx-clone{position:fixed;margin:0!important;max-width:none;pointer-events:none;overflow:hidden;
  filter:drop-shadow(0 10px 26px rgba(0,0,0,.6));animation:ctxpop .16s ease-out}
.ctx-clone .bub{transform:scale(1.03)}
.ctx-clone .meta,.ctx-clone .reacts{display:none}
.ctx-emojis{position:fixed;display:flex;gap:2px;padding:4px 6px;border-radius:99px;background:rgba(44,44,46,.97);animation:ctxpop .16s ease-out}
.ctx-emojis button{border:0;background:none;font-size:21px;width:36px;height:36px;border-radius:50%;padding:0;line-height:1}
.ctx-emojis button.on{background:#48484a}
.ctx-emojis button:active{transform:scale(1.25)}
.ctx-menu{position:fixed;width:196px;border-radius:13px;overflow:hidden;background:rgba(44,44,46,.97);animation:ctxpop .16s ease-out}
.ctx-menu button{display:flex;align-items:center;justify-content:space-between;width:100%;border:0;background:none;color:var(--text);
  padding:9px 13px;font-size:14px;text-align:left;border-top:.5px solid rgba(255,255,255,.1)}
.ctx-menu button:first-child{border-top:0}
.ctx-menu button[hidden]+button{border-top:.5px solid rgba(255,255,255,.1)}
.ctx-menu button:active{background:rgba(255,255,255,.08)}
.ctx-menu i{font-style:normal;font-size:15px;margin-left:10px}
.ctx-menu .danger{color:var(--danger)}
@keyframes ctxpop{from{transform:scale(.9);opacity:0}to{transform:none;opacity:1}}
/* actions as a row of emoji buttons (no words) */
.ctx-menu{display:flex;gap:2px;width:auto;padding:4px 6px;border-radius:99px}
.ctx-menu button{width:38px;height:38px;padding:0;justify-content:center;border:0!important;border-radius:50%}
.ctx-menu button .l{display:none}
.ctx-menu i{margin:0;font-size:19px}
.ctx-menu .danger{background:rgba(255,69,58,.16)}
.ctx-menu button:active{transform:scale(1.2)}
/* thin line icons instead of emoji */
.ctx-menu button{color:#f2f2f7}
.ctx-menu .danger{color:var(--danger);background:none}
.ctx-menu i{display:flex}
.ctx-menu svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.ctx-menu button:active{background:rgba(255,255,255,.12)}

/* ---------- replies, edits, voice, view-once, location ---------- */
.msgs{touch-action:pan-y}
.m{transition:transform .15s ease-out}
.m.swiping{transition:none}
.quote{display:block;border-left:3px solid rgba(255,255,255,.55);background:rgba(0,0,0,.18);border-radius:8px;padding:4px 8px;margin:0 0 5px;
  font-size:calc(var(--t) - 1.5px);line-height:1.3;cursor:pointer;max-width:100%}
.m.them .quote{border-left-color:var(--me)}
.quote b{display:block;font-weight:600}
.quote span{display:block;opacity:.8;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.bub.media .quote{margin:4px 4px 6px}
.cbar{display:flex;align-items:center;gap:8px;padding:6px 6px 6px 12px;background:#141416;border-top:1px solid var(--line)}
.cbar-text{flex:1;min-width:0;border-left:3px solid var(--me);padding-left:8px;font-size:calc(var(--t) - 1px)}
.cbar-text b{display:block;color:var(--me);font-weight:600}
.cbar-text span{display:block;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.mic{width:40px;height:40px;border-radius:50%;border:0;background:var(--card2);color:var(--text);flex:none;display:flex;align-items:center;justify-content:center}
.mic svg,.vplay svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.recbar{display:flex;align-items:center;gap:10px;padding:8px 8px calc(8px + env(safe-area-inset-bottom));background:rgba(28,28,30,.96);border-top:1px solid var(--line);font-size:15px}
.recbar:not([hidden]) + .composer{display:none}   /* only while recording */
.rec-dot{width:10px;height:10px;border-radius:50%;background:var(--danger);animation:blink 1s infinite}
.rec-hint{flex:1;color:var(--muted);font-size:13px}
@keyframes blink{50%{opacity:.25}}
.voice{display:flex;align-items:center;gap:8px;min-width:170px}
.vplay{width:30px;height:30px;border-radius:50%;border:0;background:rgba(255,255,255,.2);color:#fff;font-size:13px;flex:none;display:flex;align-items:center;justify-content:center;padding:0}
.vbar{flex:1;height:4px;border-radius:9px;background:rgba(255,255,255,.25);overflow:hidden}
.vbar i{display:block;height:100%;width:0;background:#fff}
.vtime{font-size:calc(var(--t) - 2px);opacity:.85;font-variant-numeric:tabular-nums}
.once{display:flex;align-items:center;gap:6px;border:0;background:none;color:inherit;font:inherit;padding:0;cursor:pointer}
.once.done{opacity:.6;cursor:default}
.loc{display:block;width:230px;color:inherit;text-decoration:none}
.loc iframe{display:block;width:100%;height:130px;border:0;border-radius:13px;pointer-events:none;background:#222}
.loc span{display:block;font-size:calc(var(--t) - 1px);padding:5px 4px 1px}
.attach-menu{position:absolute;left:8px;bottom:calc(60px + env(safe-area-inset-bottom));z-index:15;background:rgba(44,44,46,.98);border-radius:14px;overflow:hidden;
  box-shadow:0 8px 30px rgba(0,0,0,.5);animation:ctxpop .14s ease-out}
.att-opt{display:block;width:100%;border:0;background:none;color:var(--text);font:inherit;font-size:15px;text-align:left;padding:12px 16px;cursor:pointer}
.att-opt + .att-opt{border-top:.5px solid rgba(255,255,255,.1)}
.meta .edited{opacity:.9}
.who small.live{color:var(--ok)}
.who b.live{color:var(--ok)}

/* ---------- top bar opens "Shared" ---------- */
button.who{border:0;background:none;color:inherit;font:inherit;padding:2px 6px;border-radius:10px;cursor:pointer}
button.who:active{background:rgba(255,255,255,.08)}
.sheet-body.tall{min-height:70vh}
.seg{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;margin:12px 0;background:#000;padding:3px;border-radius:11px}
.seg button{border:0;background:none;color:var(--muted);padding:7px 4px;border-radius:8px;font-size:13px;font-weight:600}
.seg button.on{background:var(--card2);color:var(--text)}
.sh-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:3px}
.sh-cell{position:relative;height:0;padding-top:100%;border:0;background:#111;border-radius:6px;overflow:hidden;cursor:pointer}
.sh-cell img,.sh-cell video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;pointer-events:none;-webkit-touch-callout:none}
.sh-cell .tag{position:absolute;right:4px;bottom:3px;font-size:11px;text-shadow:0 1px 3px #000}
.sh-list{display:flex;flex-direction:column;gap:6px}
.sh-row{display:flex;align-items:center;gap:10px;background:var(--card2);border-radius:12px;padding:10px 12px;color:var(--text);text-decoration:none;font-size:14px;min-width:0}
.sh-row .sh-main{flex:1;min-width:0}
.sh-row .sh-main b{display:block;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sh-row .sh-main small{display:block;color:var(--muted);font-size:12px}
.sh-row .voice{flex:1;min-width:0}
.sh-empty{color:var(--muted);text-align:center;padding:40px 10px;font-size:14px}
.bub a.lnk{color:inherit;text-decoration:underline;word-break:break-all}
/* small, quiet status line at the top (no name) */
.who b{font-size:calc(var(--t) - 1px);font-weight:500;color:var(--muted)}
.who b.live{color:var(--ok)}
.who small:empty{display:none}

/* message box: 📎 🎤 [text] ➤ ; send is always there, faded when empty */
.send.off{opacity:.35;pointer-events:none}
.composer .mic{width:36px;height:36px;background:transparent}
/* keyboard up: no extra home-bar space under the message box */
html.kb .composer{padding-bottom:8px}

/* screen info for testing */
.vp-info{position:fixed;left:6px;right:6px;top:calc(env(safe-area-inset-top) + 4px);z-index:100;background:#ffd400;color:#000;font:600 11px/1.3 ui-monospace,Menlo,monospace;padding:4px 6px;border-radius:6px;pointer-events:none;text-align:center}